Duplex (2 Units, Any Combination)Residential
23 THORNHILL RD
RIVERSIDE, CT 06878
3
Beds
3
Baths
1,510 ft²
Living AreaTotal finished area of the structures, from county records. Some counties include shared space like hallways or a building gym, so it may not match a listing.
0.27 ac
Lot SizeThe size of the land the home sits on, from county records.
1930
Year BuiltThe year the home was originally built, according to county records.
2
StoriesHow many floors the home has above ground.
8
RoomsThe total room count in county records. Counties differ on which rooms they count, so compare it loosely.
1
ParkingThe number of parking spaces on the property, including the garage.
Valuation
1st MortgageA loan still believed to be open on this home, in the order lenders get repaid. The first position is paid back before the second.$92,000
BANK OF AMERICA · recorded Aug 4, 2016
Tax & Assessment
Property TaxThe property tax billed for this tax year. It usually pays for schools, roads, and local services.$7,676 (2025)
Assessed ValueThe value the county assigns to this home to calculate property tax. It is often lower than what the home would sell for.$621,110 (2025)
Assessed LandThe share of the county's assessed value that comes from the land itself, not the buildings.$506,170
Assessed ImprovementsThe share of the county's assessed value that comes from the buildings and other structures on the land.$114,940
Previous AssessedThe county's assessed value from the year before, useful for seeing how the assessment changed.$621,110
Assessor Market ValueThe county assessor's own opinion of market value. It is separate from our estimate and updates on the county's schedule.$434,777
Climate Risk
Overall riskThe average of the five hazard scores below, on a 0 to 100 scale. Higher means greater projected risk over the coming decades.41
1
FloodProjected flooding risk from rivers, heavy rain, and storm surge, scored 0 to 100. Higher is riskier.
4
WildfireProjected wildfire risk, scored 0 to 100, based on how much land burns in a typical year. Higher is riskier.
64
HeatProjected heat risk, scored 0 to 100, based on how many extremely hot days a year are expected. Higher is riskier.
96
StormProjected risk from heavy rainstorms, scored 0 to 100, based on how often extreme rainfall is expected. Higher is riskier.
43
DroughtProjected water shortage risk, scored 0 to 100. Higher means more strain on the local water supply.
FEMA Flood ZoneFEMA's flood zone for this address. Zones starting with A or V are high risk, and lenders usually require flood insurance there.minimal
Scores 0–100; higher = greater projected risk.
Property Facts
Property TypeThe broad category the county puts this property in, such as residential or commercial.Duplex (2 Units, Any Combination)
StyleThe architectural style of the home, such as ranch or colonial.Duplex Single
CountyWESTERN CONNECTICUT
Effective Year BuiltAn adjusted build year that accounts for condition and major remodels. A big renovation can make a home count as newer than it is.1960
Lot (acres)The size of the land the home sits on, from county records.0.27
ConstructionThe main material the home's frame and walls are built from.Frame (Unspecified)
RoofThe main material covering the roof, such as asphalt shingle or tile.Asphalt
HeatingThe type of heating system in the home.Hot Water
CoolingThe type of cooling or air conditioning in the home.Yes
GarageWhether the property has a garage, and details like whether it is attached to the home.Garage, Detached
PoolWhether the property has a pool, and what kind, such as in-ground.No
Transaction History(2)
Sales and refinances filed with the county for this home. Not every transfer is a normal sale, so check the type before comparing prices.Assigned SchoolsThe public schools this address is zoned for. Boundaries change, so confirm with the district before you count on it.
EMH
Cos Cob SchoolB
Elementary · Grades KG–5 · 0.8 mi
Central Middle SchoolA-
Middle · Grades 6–8 · 1.1 mi
Greenwich High SchoolA+
High · Grades 9–12 · 1.5 mi
District: Greenwich School District
Neighborhood · ZIP 06878These are comparison scores, not percentages. 100 equals the national average, so 150 means about 50% above average.
CrimeLocal crime compared with the rest of the country, where 100 is average. It reflects things like population density, income, and how crime gets reported.75
Air pollutionOverall air pollution compared with the rest of the country, where 100 is average. Lower is cleaner.114
EarthquakeEarthquake risk and likely building damage compared with the rest of the country, where 100 is average. Scores can run far above 100.97
Index scale: 100 = US average (tick). Lower is better.
Homes occupiedThe share of homes here that someone lives in. The rest sit empty, including vacation and for-sale homes.95%
Bachelor's or higherThe share of adults 25 and older whose highest degree is a bachelor's degree.38%
Poverty rateThe share of people whose household income falls below the federal poverty line, which varies by family size.4.5%
UnemploymentThe share of men 16 and older who are out of work and actively looking. Only men are counted in this figure.0.9%
PopulationHow many people live in this area.10,020
DensityPeople per square mile. Higher numbers mean a more crowded, urban area.2,709 / mi²
Median incomeThe middle household income here — half of households earn more, half earn less.$233,152
Average incomeThe average household income. It runs higher than the median when a few high earners pull it up.$352,822
Average tempThe average temperature here across a full year.52°F
Annual precipHow much rain and melted snow falls here in a typical year.50 in
SunshineThe share of daylight hours that get direct sun in a typical year, counting cloud cover.58%
Ownership
OccupancyWhether the owner appears to live here or somewhere else. It is inferred from the mailing address on record.Owner occupied
Company ownedWhether the owner is a company or trust rather than a person.No
Data by ATTOM. Valuations are automated estimates, not appraisals. Photos from Google Street View and may not depict the current property state.
How this home compares
23 Thornhill Rd measured against every home in its neighborhood, its ZIP code and its county, using county assessor records refreshed nightly. A home can stand out in one of those areas and look ordinary in another, because each one holds a different mix of homes.
- Smaller than 93% of homes in Riverside 06878
- Has a smaller lot than 74% of homes in Western Connecticut County
- Older than 87% of homes in Western Connecticut County
How it measures up in Riverside 06878
The dot is this home. The mark in the middle is the typical home in Riverside 06878.
Living area1,510 ft²
SmallerTypical 2,816 ft²Bigger
Bigger than 7% of homes nearby
Lot size0.27 ac
SmallerTypical 0.3 acBigger
Bigger than 33% of homes nearby
Year built1930
OlderTypical 1958Newer
Newer than 15% of homes nearby
| Measure | This home | Riverside 06878 | Western Connecticut County |
|---|---|---|---|
| Living areabigger than | 1,510 ft² | 7% of homes | 33% of homes |
| Lot sizebigger than | 0.27 ac | 33% of homes | 26% of homes |
| Year builtnewer than | 1930 | 15% of homes | 13% of homes |
About 23 Thornhill Rd
When did 23 Thornhill Rd, Riverside, CT last sell?
23 Thornhill Rd, Riverside, CT last sold on Jan 1, 1900, according to the county's recorded deed.
How big is 23 Thornhill Rd, Riverside, CT?
23 Thornhill Rd, Riverside, CT has 3 bedrooms, 3 bathrooms, 1,510 square feet of living space and a 0.27-acre lot.
When was 23 Thornhill Rd, Riverside, CT built?
23 Thornhill Rd, Riverside, CT was built in 1930, making it 96 years old. It is a duplex single home. The building has 2 stories.
What schools serve 23 Thornhill Rd, Riverside, CT?
23 Thornhill Rd, Riverside, CT is assigned to Cos Cob School (elementary), rated B; Central Middle School (middle), rated A-; Greenwich High School (high), rated A+. All sit in Greenwich School District. Attendance boundaries change — confirm with the district before relying on an assignment.
How does 23 Thornhill Rd, Riverside, CT compare to other homes in Riverside 06878?
Among the 2,615 homes in Riverside 06878, it is bigger than 7% of them (1,510 ft² against a typical 2,816 ft²), its lot is bigger than 33% of them (0.27 ac against a typical 0.3 ac) and it is newer than 15% of them (1930 against a typical 1958). These shares are recounted nightly from the full county assessor record for each area, not from active listings.
What are the property taxes on 23 Thornhill Rd, Riverside, CT?
The 2025 property tax bill for 23 Thornhill Rd, Riverside, CT was $7,676. The county assessed it at $621,110.
Closest homes
- 21 Thornhill Rd$1.4M55 ft · 3 bd · 2 ba · 1,470 ft² · Sold $665K · May 2005
- 25 Thornhill Rd$1.6M79 ft · 2 bd · 2.5 ba · 2,281 ft² · Sold Jan 1900
- 27 Thornhill Rd$2.2M97 ft · 4 bd · 3.5 ba · 2,662 ft² · Sold $1.2M · Oct 2007
- 19 Thornhill Rd$1.8M105 ft · 3 bd · 4 ba · 2,989 ft² · Sold $925K · Oct 2020
- 15 Elizabeth Ln$2.3M149 ft · 5 bd · 3.5 ba · 4,335 ft² · Sold $1.5M · Jun 2019
- 17 Thornhill Rd$1.6M155 ft · 3 bd · 3 ba · 1,990 ft² · Sold $530K · Dec 2009
- 16 Thornhill Rd$1.2M213 ft · 3 bd · 1.5 ba · 1,204 ft² · Sold $500K · Nov 2010
- 26 Thornhill Rd$1.8M201 ft · 3 bd · 2 ba · 2,557 ft² · Sold $880K · Sep 2015
More homes in Riverside 06878
- 32 Welwyn Rd$3.3M4 bd · 3 ba · 2,504 ft² · Sold $3.7M · Jul 2026
- 7 Indian Head Rd$8.1M6 bd · 6 ba · 5,728 ft² · Sold $775K · Jul 2026
- 33 N Sound Beach Ave$1M2 bd · 1 ba · 1,040 ft² · Sold $1.2M · Jul 2026
- 30 Weston Hill Rd$2.3M4 bd · 3 ba · 1,882 ft² · Sold $2.8M · Jul 2026
- 29 Coventry Ln$2.8M5 bd · 4.5 ba · 2,612 ft² · Sold $2.8M · Jul 2026
- 112 Sheephill Rd$4.6M5 bd · 3 ba · 5,683 ft² · Sold $4.4M · Jul 2026
- 1 Bramble Ln$5.9M5 bd · 6 ba · 5,131 ft² · Sold $590K · Jul 2026
- 14 Spezzano Dr$1M2 bd · 1 ba · 853 ft² · Sold $1M · Jul 2026
- 22 Wescott St$3.1M4 bd · 5.5 ba · 3,101 ft² · Sold $3.3M · Jul 2026
- 20 Weston Hill Rd$3.1M4 bd · 3.5 ba · 2,982 ft² · Sold $866K · Jul 2026
- 32 Winthrop Dr$3.6M4 bd · 2.5 ba · 2,627 ft² · Sold $3.6M · Jul 2026
- 15 Field Rd0.14 ac · Sold $6.7M · Jul 2026
Assigned schools
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